text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <iterator>
  
  // template <InputIterator Iter>
  //   Iter::difference_type
  //   distance(Iter first, Iter last);
  //
  // template <RandomAccessIterator Iter>
  //   Iter::difference_type
  //   distance(Iter first, Iter last);
  
  #include <iterator>
  #include <cassert>
  
  #include "../../iterators.h"
  
  template <class It>
  void
  test(It first, It last, typename std::iterator_traits<It>::difference_type x)
  {
      assert(std::distance(first, last) == x);
  }
  
  int main()
  {
      const char* s = "1234567890";
      test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10);
      test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10);
      test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10);
      test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10);
      test(s, s+10, 10);
  }
  